<div class="qr_code_box" @downIn>
  <div class="close" nzTitle="关闭" nzPlacement="topCenter" nz-tooltip (click)="onClose()">×</div>
  <div class="class_name">扫码加入班级</div>
  <div class="code">
     <div class="class_code">班级码:<span>{{classInfo.IDCode}}</span></div>
    <div class="invite_code">邀请码:<span>{{classInfo.InvitationCode}}</span></div>
  </div>
  <div>
    <qr-code [value]="url" size="510"></qr-code>
  </div>
</div>

